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Gotowa bibliografia na temat „Ti ba”

Autor: Grafiati

Data publikacji: 29 lipca 2024

Data aktualizacji: 30 lipca 2024

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Artykuły w czasopismach na temat "Ti ba"

Okamoto, H. "Ba-Ti (Barium-Titanium)". Journal of Phase Equilibria and Diffusion 29, nr 4 (28.05.2008): 380. http://dx.doi.org/10.1007/s11669-008-9339-3.

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Zhang, Hui, Xiao Hui Wang, Zheng Bo Shen i Ya Nan Hao. "Influence of Raw Material Ratio of Ba/Ti on Fabrication of Nanocrystalline BaTiO₃ Powder". Key Engineering Materials 602-603 (marzec 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.3.

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Nanocrystalline BaTiO3 powder was directly synthesized by a convenient one-step solvothermal route. 8~10 nm BaTiO3 with different Ba/Ti ratios are obtained by adjusting the raw material ratios. The optimum raw material ratio of Ba/Ti is obtained. And the as-prepared BaTiO3 nanoparticles are all small and uniform. Influence of the nominal Ba/Ti ratios on diameter of nanocrystalline BaTiO3 powder was investigated by XRD, TEM and XRF analyses. It was found that the Ba/Ti ratios of the raw materials have a great influence on the process of powder fabrication. When the raw material Ba/Ti ratio is low (<0.9), the reaction cannot be finished and strong BaCO3 peaks were founded as the alkalinity of the system at the later reaction stage is too low. Besides, the Ba/Ti ratio of the product rises as the raw material Ba/Ti ratio increases.

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Li, Yuan Yuan, Gui Xia Dong, Bi Yan Zhu, Qiu Xiang Liu i Di Wu. "Effect of Sintering Temperatures and Ba/Ti Ratio on Dielectric Properties of BaTiO₃ Ceramic". Advanced Materials Research 750-752 (sierpień 2013): 506–11. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.506.

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As a research object, the samples with various Ba/Ti ratios (Ba/Ti=0.95~1.05) were synthesized by solid phase reaction method. Effect of sintering temperatures and Ba/Ti ratio on dielectric properties and crystal structure of BaTiO3ceramic were investigated. Crystal structure and crystal phase composition were investigated by scanning electron microscopy and X-ray diffraction. The dielectric properties were studied by Agilent 4294A at 1 kHz. The results show that the BaTiO3ceramic has high permittivity and dielectric loss at 1340°C. The permittivity of BaTiO3ceramic with Ba/Ti=0.95 change small as the sintering temperatures vary at 1320°C. With the increasing of Ba/Ti ratio, the Curie temperature first increases and then decreases as the sample sintering at 1320°C. When Ba/Ti=1, the Curie temperature increase with the sintering temperature increasing.

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Levin, Igor, Richard D. Leapman i Debra L. Kaiser. "Microstructure and Chemistry of Nonstoichiometric (Ba,Sr)TiO3 Thin Films Deposited by Metalorganic Chemical Vapor Deposition". Journal of Materials Research 15, nr 7 (lipiec 2000): 1433–36. http://dx.doi.org/10.1557/jmr.2000.0207.

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The microstructure and chemistry of (Ba,Sr)TiO3 thin films deposited on Pt/SiO2/Si substrates by metalorganic chemical vapor deposition were studied using highresolution transmission electron microscopy and quantitative spectrum imaging in electron energy loss spectroscopy. The grain boundaries in all films with overall Ti content ranging from 50.7% to 53.4% exhibit a significant increase in Ti/Ba ratio as compared to the grain interiors. The results suggest that the deviations of Ti/(Ba + Sr) ratio from the stoichiometric value of unity are accommodated by the creation of Ba/Sr vacancies, which segregate to the grain boundary regions. The films with Ti contents equal to or greater than 52% additionally contained an amorphous Ti-rich phase at some grain boundaries and multiple grain junctions; the amount of this phase increases with increasing overall Ti content. The analysis indicates that the amorphous phase can only partially account for the significant drop in dielectric permittivity accompanying increases in the Ti/(Ba + Sr) ratio.

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Premkumar, S., S. Radhakrishnan i V. L. Mathe. "Understanding A and B-site engineered lead-free Ba(1−x)CaxZryTi(1−y)O3 piezoceramics: a perspective from DFT". Journal of Materials Chemistry C 9, nr 12 (2021): 4248–59. http://dx.doi.org/10.1039/d0tc05724j.

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DFT has been used to investigate the structural and polarization of Ba_(1-x)Ca_xZr_yTi_(1−y)O₃, perovskite solid solutions namely BaTiO₃ (BT), Ba(Zr_0.125Ti_0.875)O₃ (BZT), (Ba_0.875Ca_0.125)TiO₃ (BCT) and Ba_0.875Ca_0.125(Zr_0.125Ti_0.875)O₃ (BCZT).

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Li, W. L., T. D. Zhang, Y. F. Hou, Y. Zhao, D. Xu, W. P. Cao i W. D. Fei. "Giant piezoelectric properties of BZT–0.5BCT thin films induced by nanodomain structure". RSC Adv. 4, nr 100 (2014): 56933–37. http://dx.doi.org/10.1039/c4ra08280j.

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Ba(Zr_0.2Ti_0.8)O₃–0.5(Ba_0.7Ca_0.3)TiO₃ (BZT–0.5BCT) thin films were prepared from two ceramics targets, Ba(Zr_0.2Ti_0.8)O₃ and (Ba_0.7Ca_0.3)TiO₃, using dual-magnetron sputtering, and a LaNiO₃ (LNO) seed layer was introduced between the film and Pt(111)/Ti/SiO₂/Si substrates via a sol–gel technique.

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Lu, Da Yong, Dan Dan Han, Qiao Li Liu, Yan Dong Wang i Xiu Yun Sun. "Structure and Dielectric Properties of Ce and Ca Co-Doped BaTiO₃ Ceramics". Key Engineering Materials 680 (luty 2016): 184–88. http://dx.doi.org/10.4028/www.scientific.net/kem.680.184.

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Structure and dielectric properties of 5 % Ce and Ca co-doped BaTiO3 ceramics were investigated. The site occupations and valence states were studied using XRD, Raman spectroscopy, SEM, EPR and dielectric measurements. The Ba/Ti ratio has dramatic effects on ceramic structure and properties. Two single-phase ceramics with Ba/Ti = 1 and 0.937 have tetragonal and cubic structure, showing diffuse phase transition and first-order phase transition behaviors, respectively. The former exhibit the site occupations of mixed Ca2+/Ce3+ at Ba sites and Ca2+/Ce4+ at Ti sites. Ce ions have priority over Ca2+ ions in entering Ti sites as Ce4+ when co-doping in BaTiO3, which will impede Ca2+ ions to be incorporated completely into Ti sites.

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Solovova, I. P., i A. V. Girnis. "Silicate–carbonate liquid immiscibility and crystallization of carbonate and K-rich basaltic magma: insights from melt and fluid inclusions". Mineralogical Magazine 76, nr 2 (kwiecień 2012): 411–39. http://dx.doi.org/10.1180/minmag.2012.076.2.09.

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AbstractThis paper reports an investigation of the crystallization products of K-rich silicate and carbonate melts trapped as melt inclusions in clinopyroxene phenocrysts from the Dunkeldyk alkaline igneous complex in the Tajik Republic. Heating experiments on the melt inclusions suggest that the carbonate melt was formed by liquid immiscibility at 1180°C and ∼0.5 GPa. The carbonate-rich inclusions are dominated by Sr-bearing calcite, and rich in incompatible elements. Most of the silicate minerals are SiO2-poor and rich in K, Ba and Ti. Leucite, kalsilite and aegirine are the earliest magmatic minerals. High Ba and Ti contents in the melt resulted in the crystallization of Ba-rich K-feldspar, titanite, perovskite and Ti-bearing garnet, and the rare Ba-Ti silicates fresnoite and delindeite. The last minerals to crystallize from volatile-rich melts and fluids were aegirine, götzenite, K-Ba- and Ca-Sr-bearing zeolites, fluorite and strontium-rich baryte. Interaction of the early minerals with residual melts and fluids produced Ba-rich phlogopite and Sr-rich apatite.

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Cheng, Xuxin, Xiaoming Chen, Xiaoxia Li, Haining Cui i Chao Xiong. "Influence of Ba/Ti ratio on PTCR effect of Bam(Ti1−xNbx)O3 ceramics prepared by the reduction sintering-reoxidation method". Modern Physics Letters B 32, nr 34n36 (30.12.2018): 1840071. http://dx.doi.org/10.1142/s0217984918400717.

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In this work, we investigate the influences of Ba/Ti ratio and sintering conditions on the characteristics of positive temperature coefficient of resistance (PTCR) and electrical properties of Ba[Formula: see text](Ti[Formula: see text]Nb[Formula: see text])O3 (BTN) ceramics. The ceramics were fired at 1190[Formula: see text]C for 0.5–6.0 h in a reducing atmosphere and then reoxidized at 600–650[Formula: see text]C for 0–8 h. The Ba/Ti ratio [Formula: see text] affected the electrical properties and PTCR effect of the BTN specimens. The room-temperature (RT) resistance of the BTN samples initially decreased [Formula: see text] and then increased [Formula: see text] as the Ba/Ti ratio increased. Moreover, BTN ceramics exhibit a pronounced PTCR effect, with a resistance jump greater by 3.0 orders of magnitude and a low 0.1 [Formula: see text] RT resistance at a low reoxidation temperature of 600[Formula: see text]C after sintering under a reducing atmosphere. Furthermore, the average sample grain size increased along with the Ba/Ti ratio. In addition, the influence of the sintering time and the reoxidation time on the electrical properties and the PTCR effect were also investigated.

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Ơn, Đỗ Viết, Đỗ Phương Anh, Nguyễn Văn Thịnh, Võ Thanh Tùng i Trương Văn Chương. "ẢNH HƯỞNG CỦA TỈ LỆ Ba/Ti LÊN ĐẶC TRƯNG CỦA HẠT NANO BaTiO3 TỔNG HỢP BẰNG PHƯƠNG PHÁP THỦY NHIỆT". Hue University Journal of Science: Natural Science 130, nr 1A (10.03.2021): 23–29. http://dx.doi.org/10.26459/hueunijns.v130i1a.5950.

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Vật liệu BaTiO3 nano hình cầu phân tán cao với kích thước đồng đều được tổng hợp bằng phương pháp thủy nhiệt. Ảnh hưởng của tỉ lệ mol Ba/Ti lên sự hình thành vật liệu được nghiên cứu bằng cách phân tích dữ liệu XRD và SEM. TiO2·nH2O tổng hợp bằng phương pháp axit sunfuric với sự hỗ trợ sóng siêu âm được sử dụng làm nguyên liệu ban đầu. Vật liệu nano BaTiO3 hình cầu với độ phân tán cao và kích thước trung bình khoảng 100 nm đã thu được tại 200 °C trong 12 giờ với tỉ lệ Ba/Ti = 1,5. Tỷ lệ Ba/Ti ảnh hưởng mạnh đến sự hình thành BaTiO3 nano hình cầu với quá trình chuyển pha. Khi tăng tỉ lệ Ba/Ti, kích thước hạt tăng và tính đồng nhất giảm.

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Rozprawy doktorskie na temat "Ti ba"

Amoroso, Danila. "Étude ab-initio de solutions solides piézoélectriques (Ba,Ca)TiO3-Ba(Ti,Zr)O3". Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0163/document.

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Les piézoélectriques à haute performance sont des composants clés pour les dispositifs agiles. Il a été démontré récemment que les solutions solides (Ba,Ca)(Ti,Zr)O3 (BCTZ) présentent des propriétés électromécaniques prometteuses. Cependant, les mécanismes microscopiques conduisant à de telles caractéristiques restent à éclaircir, et les investigations théoriques de BCTZ demeurent très limitées à ce jour. En conséquence, cette thèse propose d’étudier les propriétés de différentes compositions de solutions solides (Ba,Ca)TiO3-Ba(Ti,Zr)O3 au moyen de calculs de premiers principes, en mettant l’accent sur la dynamiquedu réseau et sur la compétition entre différentes phases ferroélectriques. Nous nous intéressons d’abord aux quatre composés parents BaTiO3, CaTiO3, BaZrO3 et CaZrO3, afin de comparer leurs propriétés et leurs différentes tendances à la ferroélectricité. Ensuite, le coeur de notre étude est une caractérisation systématique des systèmes binaires (Ba,Ca)TiO3 et Ba(Ti,Zr)O3 en utilisant à la fois l’approximation du cristal virtuel (VCA) et des calculs directs sur supercellules.Lorsqu’on passe continument de BaTiO3 à CaTiO3 dans (Ba,Ca)TiO3, la caractéristique principale est une transformation progressive de la ferroélectricité de type B en type A en raison d’effets stériques, lesquels déterminent en grande partie le comportement du système. En particulier, pour les petites concentrations en calcium, nous avons mis en évidence que laferroélectricité guidée par le site B est globalement affaiblie, conduisant à la disparition de la barrière d’énergie entre différents états polaires et à une polarisation quasi-isotrope. Une amélioration considérable de la réponse piézoélectrique résulte de ces caractéristiques. En passant de BaTiO3 à BaZrO3 dans Ba(Ti,Zr)O3, en revanche, le comportement est dominé parles mouvements coopératifs Zr-Ti et l’électrostatique locale. En particulier, la phase R3m est stabilisée significativement pour les faibles concentrations en zirconium. Sous l’effet d’une augmentation de la concentration en zirconium, le système montre une tendance à la réduction de la distorsion polaire; néanmoins, la ferroélectricité peut être préservée localement dans les régionsriches en titane. Grâce à un modèle électrostatique basé sur un super-réseau BaZrO3/mBaTiO3, nous avons également découvert une activation polaire inattendue pour Zr, en fonction d’un ordre atomique spécifique. Un facteur microscopique expliquant la réponse piézoélectrique exaltée dans BCTZ, pour de faibles concentrations en Ca et Zr, peut donc résider dans l’interaction entre la ferroélectricité affaiblie induite par Ti et la ferroélectricité émergente induite par Ca, interaction produisant une anisotropie minimale pour la polarisation. En outre, notre étude comparative révèle que la physique microscopique spécifique de ces solutions solides limite sévèrement l’applicabilité de l’approximation du cristal virtuel (VCA) à ces systèmes
High-performance piezoelectrics are key components of various smart devicesand, recently, it has been discovered that (Ba,Ca)(Ti,Zr)O3 (BCTZ) solid solutions show appealingelectromechanical properties. Nevertheless, the microscopic mechanisms leading to suchfeatures are still unclear and theoretical investigations of BCTZ remain very limited. Accordingly,this thesis analyzes the properties of various compositions of (Ba,Ca)TiO3-Ba(Ti,Zr)O3solid solutions by means of first-principles calculations, with a focus on the lattice dynamicsand the competition between different ferroelectric phases. We first analyze the four parentcompounds BaTiO3, CaTiO3, BaZrO3 and CaZrO3 in order to compare their properties andtheir different tendency towards ferroelectricity. Then, the core of our study is a systematiccharacterization of the binary systems (Ba,Ca)TiO3 and Ba(Ti,Zr)O3 within both the virtualcrystal approximation (VCA) and direct supercell calculations. When going from BaTiO3 toCaTiO3 in (Ba,Ca)TiO3, the main feature is a gradual transformation from B-type to A-typeferroelectricity due to steric effects that largely determine the behavior of the system. In particular,for low Ca-concentration we found out an overall weakened B-driven ferroelectricitythat produces the vanishing of the energy barrier between different polar states and resultsin a quasi-isotropic polarization. A sizable enhancement of the piezoelectric response resultsfrom these features. When going from BaTiO3 to BaZrO3 in Ba(Ti,Zr)O3, in contrast, thebehavior is dominated by cooperative Zr-Ti motions and the local electrostatics. In particular,low Zr-concentration produces the further stabilization of the R3m-phase. Then, the systemshows the tendency to globally reduce the polar distortion with increasing Zr-concentration.Nevertheless, ferroelectricity can be locally preserved in Ti-rich regions. We also found out anunexpected polar activation of Zr as a function of specific atomic ordering explained via a basicelectrostatic model based on BaZrO3/mBaTiO3 superlattice. A microscopic factor behind theenhanced piezoelectric response in BCTZ, at low concentration of Ca and Zr, can thus be theinterplay between weakened Ti-driven and emerging Ca-driven ferroelectricity, which producesminimal anisotropy for the polarization. In addition, our comparative study reveals that thespecific microscopic physics of these solid solutions sets severe limits to the applicability of thevirtual crystal approximation (VCA) for these systems

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Kuvatov, Azamat. "Polungs- und Biegeverhalten von Ba(Ti, Sn)O3-Keramiken mit einem Funktionsgradienten". [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975671650.

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Franklyn, Paul John. "Synthesis, characterisation and structural investigations of nanoparticulate forms of selected (W, Ti, Al, Ba) mixed metal oxides". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610234.

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Bijalwan, Vijay. "Studie syntéz a přípravy bezolovnaté keramiky (Ba,Ca)(Ti,Zr)O3 v závislosti na struktuře a výsledných vlastností". Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2018. http://www.nusl.cz/ntk/nusl-390293.

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V poslední době je snahou nahradit klasickou komerční olovnatou piezoelektrickou keramiku bezolovnatou, z důvodu zvýšeného zájmu o ochranu životního prostředí a zdraví. Různé typy materiálů již byly navrženy, jako například (K, Na) NbO3 (KNN), (Bi, Na) TiO3 (BNT), (Bi, Na) TiO3 – BaTiO3 (BNT-BT), ale jejich piezoelektrické vlastnosti zatím nedosáhly takových hodnot jako u olovnatý chkeramik (např. olovnatý titanát olova ((Pb Zr)TiO3). Nejvíce se olovnatým materiálů blíží bezolovnatý systém na bázi (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 nebo (Ba, Ca) (Zr, Ti) O3 ((1-x)BZT-xBCT, BCZT) a to díky vysokým piezoelektrickým a dielektrickým parametrům. Nevýhodou tohoto prostředku je jeho velmi vysoká teplota slinování (1520 ° C) za účelem dosažení vysokých piezoelektrických vlastností (např. Piezoelektrické konstanty d33 > 600 pC / N). Tato práce se zabývá bezolovnatou keramikou na bázi BCZT, její výrobou a vylepšením piezoelektrických vlastností dopováním CeO2. Přidáním CeO2 (y wt.%) do (Ba0.85Ca0.15) (Zr0.1Ti0.9) O3 se výrazně snížila slinovací teplota a došlo ke zhutnění při 1350°C. U této kompozice se Curieova teplota pohybovala kolem TC~105°C a velikost zrn byla v rozmezí ~ 10-13 m. Fázový přechod z romboedrické struktury na tetragonální (R-T) byl zjištěn pomocí rentgenové spektroskopie u y = 0 - 0.1 wt.%, což koreluje s výsledky Ramanovy spektrální analýzy. Mikrostrukturní a strukturní charakteristiky byly detailně studovány v korelaci s dielektrickými, feroelektrickými a piezoelektrickými vlastnostmi. Nejlepší funkční vlastnosti byly dosaženy pro keramiku BCZT – 0.07 wt.% CeO2. Tato keramika vykazovala piezoelektrický nábojový koeficient d33 = 507±20pC/N, elektromechanický planární koeficient kp = 51.8 %, dielektrickou konstantu r = 4091±100, ztrátový činitel tan = 0.02, remanentní polarizaci Pr = 13.58C/cm2, intenzitu koercitivního pole EC = 2.13kV/cm při normovaném napětí, d33* nebo Smax/Emax = 840pm/V. Dvoustupňovou kalcinační technikou bylo docíleno homogenního růstu zrn s vysokou relativní hustotou (~ 99% teoretické hustoty). Tato kompozice BCZT- CeO2 vykazovala stálé feroelektrické, dielektrické a piezoelektrické vlastností i při velikosti zrn 10 µm. Bezolovnatá piezoelektrická keramika (Ba0.85Ca0.15-y Cey) (Zr0.1Ti0.9) O3 (BCCeZT) byla dále dopována CeO2 s cílem substituce Ce4+ v místě A krystalické mřížky. Posunutí rentgenových vrcholů k vyšším úhlům naznačuje kontrakce mřížky, což by mohlo způsobit obsazení iontů ceru v místech A této soustavy. Bylo zjištěno, že velikost zrn kolem 10 - 12 m je významná pro vysokou piezoaktivitu bezolovnaté BCCeZT keramiky. Nejvyšší piezoelektrické vlastnosti tato keramika vykazovala při y;Ce = 0.00135 a slinovaná na teplotě 1350°C/4h, kdy piezoelektrické parametry byly d33 = 501±10 pC/N, kp = 38.5±1.92 %, Pr = 12.19 C/cm2, TC = 108.1 °C a s maximální deformací S do 0.14 %. Pro další studium substituce v místě A, byly vyrobeny keramické materiály (Ba1-x-y Cax Cey) (Zr0.1 Ti0.9) O3 (x:Ca = 0.05, 0.10, 0.15, 0.20 a y;Ce = 0.00135). Opět se ukázalo, že pokud byla velikost zrn ~13um, tak keramika vykazovala vysoké piezoelektrické vlastnosti (d33 = 457pC/N) pro x = 0.15 % kalcinované na teplotě 1425 °C. Když se se velikost zrn zvýšila nad 16 um, piezoelektrický nábojový koeficient d33 klesl na 200 pC/N. Rentgenová analýza ukázala změnu fázové struktury z rombické na tetragonální při zvýšení obsahu vápníku.

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Eliziário, Sayonara Andrade [UNESP]. "Síntese de perovskitas nanométricas com estrutura 'PB IND.1-x''M IND.X''TI''O IND.3'(M='BA', 'CA' e 'SR')". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/92042.

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O presente trabalho teve como objetivo estudar a formação dos pós com sistemas Pb1-xBaxTiO3, Pb1-xCaxTiO3 e Pb1-xSrxTiO3, em que x = 0; 0,25; 0,5; 0,75 e 1, por intermédio do método hidrotermal associado ao aquecimento em forno de microondas. Estudos foram realizados para a obtenção de um maior entendimento das diferentes propriedades ópticas e eletrônicas das perovskitas, em função da concentração dos dopantes e dos diferentes tempos utilizados nas sínteses. A fim de verificar as suas características estruturais estes pós foram analisados por difração de raios X (DRX), espectroscopia de absorção na região do ultravioleta visível (UV-vis), espectroscopia na região do infravermelho (IV) e de fotoluminescência (FL). Os resultados de DRX confirmaram a presença da fase Pb1-xBaxTiO3 juntamente com a fase BaCO3, enquanto que as fases Pb1-xCaxTiO3 e Pb1-xSrxTiO3 apresentam-se monofásicas. As micrografias obtidas por microscopia eletrônica de varredura com canhão de elétrons por emissão de campo (FEG-MEV) indicam o mecanismo de cristalização-dissolução-recristalização para as amostras do sistema Pb0,5Ba0,5TiO3 e formação de mesocristais para as amostras de PCT. Todos os materiais sintetizados apresentaram propriedades fotoluminescentes, apresentando emissões na região de diferentes comprimentos de onda, sugerindo que as amostras possuem propriedades estruturais que dependem do cátion adicionado. Dessa forma, a emissão pode ser atribuída a distorções nos clusters [TiO6], bem como a existência de clusters complexos de [TiO5], [BaO11], [CaO11] e [SrO11] associados as vacâncias de oxigênio. Testes de aplicação de ferroeletricidade foram realizados, porém as amostras sofreram baixa densificação devido a volatilização do chumbo, no aquecimento em forno convencional
In this work, were studied the formation of powders by microwave hydrothermal method in systems Pb1-xBaxTiO3, Pb1-xCaxTiO3 and Pb1-xSrxTiO3, where x = 0, 0.25, 0.5, 0, 75 and 1. Studies were conducted to obtain a greater understanding of the different optical and electronic properties of perovskites, depending on the concentration of dopants and different times used in the synthesis. These powders were analyzed by X-ray diffraction (XRD), scanning electron microscopy field emission gun (FEG-SEM), ultraviolet visible spectroscopy (UV-vis) infrared spectroscopy (IV) and photoluminescence spectroscopy (PL). The XRD patterns confirmed the second phase BaCO3 in Pb1-xBaxTiO3, while the phase Pb1-xSrxTiO3 present single-phase and the phase Pb1-xCaxTiO3 present two structural phases of same composition at 140 °C. FEG-SEM micrographs indicate the mechanism of crystallization-dissolution-recrystallization for samples of the system Pb0,5Ba0,5TiO3 and „„non-classical crystallization‟‟ with mesocrystal formation for samples of the system PCT. All materials synthesized showed photoluminescent properties, showing regions emissions of different wavelengths, suggesting that samples have structural properties that depend on the cation added. Thus, the emission can be attributed distortions in the clusters [TiO6], and existence of complex clusters [TiO5], [BaO11], [CaO11] e [SrO11] associated oxygen vacancies. Tests were performed applying ferroelectricity, but the samples were subjected to low densification due to volatilization of lead in the conventional oven heating

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Eliziário, Sayonara Andrade. "Síntese de perovskitas nanométricas com estrutura 'PB IND.1-x''M IND.X''TI''O IND.3'(M='BA', 'CA' e 'SR') /". Araraquara [s.n.], 2010. http://hdl.handle.net/11449/92042.

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Resumo: O presente trabalho teve como objetivo estudar a formação dos pós com sistemas Pb1-xBaxTiO3, Pb1-xCaxTiO3 e Pb1-xSrxTiO3, em que x = 0; 0,25; 0,5; 0,75 e 1, por intermédio do método hidrotermal associado ao aquecimento em forno de microondas. Estudos foram realizados para a obtenção de um maior entendimento das diferentes propriedades ópticas e eletrônicas das perovskitas, em função da concentração dos dopantes e dos diferentes tempos utilizados nas sínteses. A fim de verificar as suas características estruturais estes pós foram analisados por difração de raios X (DRX), espectroscopia de absorção na região do ultravioleta visível (UV-vis), espectroscopia na região do infravermelho (IV) e de fotoluminescência (FL). Os resultados de DRX confirmaram a presença da fase Pb1-xBaxTiO3 juntamente com a fase BaCO3, enquanto que as fases Pb1-xCaxTiO3 e Pb1-xSrxTiO3 apresentam-se monofásicas. As micrografias obtidas por microscopia eletrônica de varredura com canhão de elétrons por emissão de campo (FEG-MEV) indicam o mecanismo de cristalização-dissolução-recristalização para as amostras do sistema Pb0,5Ba0,5TiO3 e formação de mesocristais para as amostras de PCT. Todos os materiais sintetizados apresentaram propriedades fotoluminescentes, apresentando emissões na região de diferentes comprimentos de onda, sugerindo que as amostras possuem propriedades estruturais que dependem do cátion adicionado. Dessa forma, a emissão pode ser atribuída a distorções nos clusters [TiO6], bem como a existência de clusters complexos de [TiO5], [BaO11], [CaO11] e [SrO11] associados as vacâncias de oxigênio. Testes de aplicação de ferroeletricidade foram realizados, porém as amostras sofreram baixa densificação devido a volatilização do chumbo, no aquecimento em forno convencional
Abstract: In this work, were studied the formation of powders by microwave hydrothermal method in systems Pb1-xBaxTiO3, Pb1-xCaxTiO3 and Pb1-xSrxTiO3, where x = 0, 0.25, 0.5, 0, 75 and 1. Studies were conducted to obtain a greater understanding of the different optical and electronic properties of perovskites, depending on the concentration of dopants and different times used in the synthesis. These powders were analyzed by X-ray diffraction (XRD), scanning electron microscopy field emission gun (FEG-SEM), ultraviolet visible spectroscopy (UV-vis) infrared spectroscopy (IV) and photoluminescence spectroscopy (PL). The XRD patterns confirmed the second phase BaCO3 in Pb1-xBaxTiO3, while the phase Pb1-xSrxTiO3 present single-phase and the phase Pb1-xCaxTiO3 present two structural phases of same composition at 140 °C. FEG-SEM micrographs indicate the mechanism of crystallization-dissolution-recrystallization for samples of the system Pb0,5Ba0,5TiO3 and „„non-classical crystallization‟‟ with mesocrystal formation for samples of the system PCT. All materials synthesized showed photoluminescent properties, showing regions emissions of different wavelengths, suggesting that samples have structural properties that depend on the cation added. Thus, the emission can be attributed distortions in the clusters [TiO6], and existence of complex clusters [TiO5], [BaO11], [CaO11] e [SrO11] associated oxygen vacancies. Tests were performed applying ferroelectricity, but the samples were subjected to low densification due to volatilization of lead in the conventional oven heating
Orientador: Elson Longo da Silva
Coorientador: Paulo Roberto Bueno
Banca: Paulo Noronha Lisboa Filho
Banca: Paulo Sergio Pizani
Banca: Jose Waldo Martinez Espinosa
Banca: Cristiano Morita Barado
Doutor

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TEYMOURI, AIDMOHAMMAD. "Etude des proprietes catalytiques de perovskites abo#3 (a=ba, sr, ca; b=ti, zr, sn) en couplage oxydant du methane". Université Louis Pasteur (Strasbourg) (1971-2008), 1994. http://www.theses.fr/1994STR13093.

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La reactivite en couplage oxydant du methane (formation d'ethane et d'ethylene) a ete etudiee sur des composes a structure definie, perovskite abo#3 (a=ba, sr, ca; b=ti, zr, sn). La premiere partie du travail comprend l'etude de la preparation des perovskites et la caracterisation primaire (rx, ft-ir, b. E. T. , m. E. B. ). Differentes preparations sol-gel a partir de precurseurs oxydes et a partir de precurseurs chlores ont ete obtenues. L'ensemble des preparations montre que l'addition de l'element chlore dans la preparation est tres favorable pour la selectivite en c#2. Cette remarque est d'autant plus verifiee que le comportement de la perovskite, voie oxyde est plus oxydant. L'addition de molecules chlorees organiques dans les gaz reactionnels confirme l'influence du chlore sur l'augmentation de la selectivite en c#2. Des mesures d'esca, de microanalyse ont permis de montrer les variations de composition entre surface et cur du catalyseur. Des mesures de t. P. D. Ont mis en evidence plusieurs types d'oxygene adsorbes sur la surface, montre des differences importantes d'adsorption entre precurseurs chlores et oxygenes. Ces differences sont retrouvees lors des mesures de basicite de surface par adsorption d'acide benzoique ou de co#2. L'ensemble de ces travaux a conduit a proposer un schema reactionnel pour la reaction et a edicter quelques regles permettant l'obtention de catalyseurs perovskites performants en couplage oxydant

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Daniele, Stéphane. "Synthese, caracterisation et evaluation par le procede sol-gel d'alcoxydes heterometalliques ln-m-ti (ln = lanthanides, m = ba, pb) : precurseurs pour ceramiques dielectriques et electrooptiques". Nice, 1995. http://www.theses.fr/1995NICE4827.

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Une serie d'alcoxydes heterometalliques bati et pbti de stoechiometrie 1:1 (ba#2ti#2(thd)#4(oet)#8(hoet)#2, ba#2ti#2(acac)#4(oet)#8 et pb#2ti#2oz(o#ipr)#8 avec z = o#ipr, oac, acac) a ete obtenue selon differentes voies d'acces. L'evaluation de ces precurseurs par le procede sol-gel a conduit aux perovskites batio#3 et pbtio#3 a 700 et 500c respectivement. L'utilisation de l'acetone et la presence de ligands b-dicetonates a permis d'obtenir des sols a priori interessants pour l'elaboration de films. L'acetone a egalement joue le role d'agent de condensation en milieu non hydrolytique. Differentes voies d'acces aux alcoxydes homometalliques de praseodyme et de gadolinium ont ete explorees. Ln#5o(o#ipr)#1#3 et ln#3(o#tbu)#9(ho#tbu)#2 se sont averes etre des formulations valables pour tous les lanthanides. Leur utilisation a permis d'obtenir respectivement des alcoxydes heterometalliques de stoechiomietries ln#4m' (m' = ti, zr, ln) et ln#3m (m = ba, pb, k). La reactivite des molecules d'alcool de ln#3(o#tbu)#9(ho#tbu)#2 vis-a-vis de composes a liaisons labiles (m-n, m-c) est un moyen pour contourner l'inertie ou la non disponibilite de certains alcoxydes, zinc et nickel en particulier. Le synthon ln-k a permis la synthese d'un compose ln-cu par reaction de metathese avec cucl#2. Enfin l'hydrolyse du compose la-ba donne, a temperature ambiante, une phase cristallisee metastable inconnue pour le systeme la#2o#3-bao. Les acetates sont egalement des precurseurs d'oxydes. Les acetates d'yttrium et de gadolinium reagissent avec differents alcoxydes m(or)#4 (m = ti, zr ; r = #ipr, c#2h#4ome) pour former des acetatoalcoxydes heterometalliques de stoechiometries lnzr#3, lnzr, ln#3zr#2 et lnti#7. L'hydrolyse de gdzr#3(oac)#3(o#ipr)#1#0#2 conduit a la cristallisation, des 600c, de la zircone cubique dopee a 25% par gd#2o#3

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Fompeyrine, Jean. "Propriétés structurales et magnétiques de quelques phases dérivées de la perovskite dans les systèmes La-Ti-O et Ba(M,M') - F-Cl (M,M'élément 3 D)". Phd thesis, Université Sciences et Technologies - Bordeaux I, 1995. http://tel.archives-ouvertes.fr/tel-00148927.

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L'investigation du système La4TI3O12-LaTiO3 a permis de mettre en évidence une nouvelle série homologue de formulation LanTin-xO3n. Les structures de ces phases ont été caractérisées par diffraction des rayons X sur poudre et par microscopie électronique en transmission. Elles dérivent de différents polytypes de perovskites hexagonales et présentent une distorsion structurale due a la rotation coopérative des octaèdres autour de leurs axes ternaires. Une nouvelle serie de composes Ba2MM' F7Cl (M, M' = Mn, Fe, Co, Ni, Zn), dont les structures ont été déterminées par diffraction des rayons X sur monocristal, a été par ailleurs mis en évidence. Une étude comparative des propriétés structurales et magnétiques avec celles des composés de la série BaMF4 a été effectuée (filiation structurale résultant de différentes rotations coopératives des octaèdres, mesures d' aimantation sur poudre et monocristal, détermination des structures magnétiques de Ba2Co2F7Cl et Ba2Ni2F7Cl par diffraction des neutrons). Un nouveau chlorofluorure du cuivre a également été caractérise sur le plan structural et magnétique. Dans ce cas, une filiation structurale avec la structure de l'apatite et avec celle de phases derivees est proposée.

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Mesquita, Alexandre. "Síntese e caracterização estrutural e dielétrica de compostos ferroelétricos \'PB IND.1-X\'\'R IND.X\'\'ZR IND.0,40\'\'TI IND.0,60\'\'O IND.3\' (R = La, Ba)". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-19042011-172117/.

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O titanato e zirconato de chumbo \'PB\'(\'ZR\'1-y\'TI\'y)\'O IND.3\' é um material ferroelétrico de estrutura perovskita que tem sido aplicado como transdutores, amplificadores, sensores piezoelétricos, piroelétricos e memórias ferroelétricas. É bem estabelecido que a incorporação de íons de \'LA POT.3+\' ou \'BA POT.2+\' nos sítios ocupados pelo \'PB\' no sistema \'PB\'(\'ZR\'1-y\'TI\'y)\'O\' (PZT), formando os sistemas \'PB\'1-x\'LA\'x\'ZR\'1-y\'TI\'y\'O IND.3\' (PLZT) e \'PB\'1-x\'BA\'x\'ZR\'1-y\'TI\'y\'O IND.3\' (PBZT), provoca mudanças significativas nas suas propriedades. No entanto, poucos trabalhos tem sido dedicados a esses sistemas contendo altas concentrações de \'TI\', principalmente no que se refere à estrutura desses materiais. Assim, este trabalho teve por objetivo analisar as propriedades estruturais e suas correlações com as propriedades dielétricas dos sistemas \'PB\'1-x\'LA\'x\'ZR\'0,40\'TI\'0,60\'O IND.3\' (PLZT100x) e \'PB\'1-x\'BA\'x\'ZR\'0,40\'TI\'0,60\'O IND.3\' (PBZT100x) em função da composição e da temperatura. Foram preparadas amostras cerâmicas por meio de sinterização convencional com x variando entre 0,05 e 0,21 para o sistema PLZT e entre 0,10 e 0,50 para o sistema PBZT. Em relação à estrutura a longa distância, medidas de difração de raios X mostraram uma diminuição no grau de tetragonalidade com o aumento da concentração dos cátions substituintes, que foi atribuída à formação de vacâncias no sítio A (caso do \'LA\') e diferença entre o raio iônico (caso do \'BA\'). Estas alterações estruturais em função da composição foram também responsáveis pelo aumento do grau de difusidade das curvas de permissividade dielétrica e pela observação de um estado ferroelétrico relaxor nas amostras contendo altas concentrações de \'LA\' e \'BA\'. Em relação à estrutural local, os resultados obtidos através da técnica de espectroscopia de absorção de raios X (XAS) nas bordas \'K\' do \'TI\' e LIII do \'PB\' mostraram que a incorporação de átomos de \'LA\' ou \'BA\' à estrutura do PZT leva a uma redução no deslocamento do átomo de \'TI\' em relação ao centro do octaedro \'TI\'O IND.6\' e mudanças na ordem local do átomo de \'PB\'. No que tange as composições contendo 21% at. de \'LA\' e 50% at. de \'BA\', diferentemente dos resultados de DRX que mostraram uma simetria cúbica, a técnica de XAS mostrou uma simetria local tetragonal. Em bom acordo com os resultados obtidos pela técnica de espectroscopia Raman, espectros EXAFS medidos em altas temperaturas mostraram também que a estrutura local não é compatível com uma estrutura de simetria cúbica. Espectros XANES medidos na borda \'K\' do oxigênio revelaram uma redução no grau de hibridização entre os estados 2p do \'O\' com 6sp do \'PB\' à medida que a concentração de \'LA\' ou \'BA\' aumenta, que estaria relacionada com o surgimento de comportamento relaxor. Amostras cerâmicas densas nanoestruturadas de composição PZT, PLZT11 e PBZT10 foram preparadas pelo método de spark plasma sintering (SPS) a fim de analisar a influência do tamanho de grão. Foi verificado que as amostras sinterizadas por SPS apresentam tamanho de grão em torno de 60 nm. A caracterização dielétrica destas amostras mostra que a redução do tamanho de grão causa uma redução no valor de máximo da permissividade dielétrica e características difusas da permissividade em função da temperatura devido ao aumento das regiões de contorno de grão.
Lead titanate zirconate (\'PB\'(\'ZR\'1-x\'TI\'x)\'O IND.3\') are ferroelectric materials with perovskite structure which has been used as transducers, capacitors, piezoelectric and pyroelectric sensors and ferroelectric memories. The substitution of \'PB POT.+2\' ions by \'LA POT.+3\' or \'BA POT.+2\' ions in the \'PB\'(\'ZR\'1-x\'TI\'x)\'O IND.3\' (PZT) system, which leads to the formation of the \'PB\'1-x\'LA\'x\'ZR\'1-y\'TI\'y\'O IND.3\' (PLZT) and the \'PB\'1-x\'BA\'x\'ZR\'1-y\'TI\'y\'O IND.3\' (PBZT) systems, induces several changes in the electric and structural properties of these materials. However, PLZT or PBZT systems based on \'TI\'-rich compositions have not been thoroughly investigated and the literature contains few reports concerning their structure. Thus, the main objectives of this doctoral thesis were the synthesis and structural characterization of \'PB\'1-x\'R\'x\'ZR\'0.40\'TI\'0.60\'O IND.3\' ferroelectric ceramic samples, with R = \'BA\' and \'LA\' and x between 0.00 to 0.50 (PLZT100x and PBZT100x). The characterization with X-ray diffraction technique of these samples showed a decrease of the tetragonality degree with increase of the doping cation concentration, which was related to the appearance of defects caused by the incorporation of \'LA\' or \'BA\' cations. These structural modifications were also responsible by the increase of the diffuseness at the dielectric permittivity and a relaxor behavior as a function of the \'LA\' or \'BA\' concentration. Concerning the local structure, XANES spectra in the absorption edge of various elements in PLZT and PBZT samples were performed. In the cases of \'TI\' \'K\'-edge absorption, the doping of \'LA\' and \'BA\' atoms in the PZT structure leads to a reduction of the displacement of \'TI\' atom in the center of the \'TI\'O IND.6\' octahedron. However, even when the crystal structure is cubic, a local octahedron distortion remains. EXAFS measurements in \'PB\' LIII-edge and \'ZR\' \'K\'-edge were performed and also indicate that local structure around lead or zirconium atoms is also affected by the introduction of \'LA\' and \'BA\' atoms in the PZT structure. In addition, XANES spectra measured at \'O\' \'K\'-edge revealed a reduction in the hybridization degree between \'O\' 2p and \'PB\' 6sp states with the addition of \'LA\' or \'BA\' atoms to the structure of PZT. It has been shown that hybridization between these states is essential to ferroelectricity and this reduction would be related to the relaxor behavior. PLZT and PBZT systems were also studied depending on the size of particle size in a nanometer scale. Thus samples PZT, PLZT11 and PBZT10 compositions were prepared using the synthesis method of precursor polymers and the process of sintering by spark plasma. A pronounced decrease in the values of maximum permittivity was observed and the dielectric curve as a function of the temperature exhibits a diffuse behavior. This size-induced diffuse phase transition and the reduction of the permittivity magnitude could be related to the differences between the core grain and the grain boundaries.

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Książki na temat "Ti ba"

1071-1128, Huihong, i Yuan Haowen 1190-1257, red. Wenshan ti ba. Beijing: Zhonghua shu ju, 1985.

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1037-1101, Su Shi, red. Yuanfeng ti ba. Beijing: Zhonghua shu ju, 1985.

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Youxiang, Tu, red. Dongpo ti ba. Shanghai: Shanghai yuan dong chu ban she, 1996.

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1130-1200, Zhu Xi, red. Wujiu ti ba. Beijing: Zhonghua shu ju, 1985.

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1049-1100, Qin Guan, i Mi Fu 1051-1107, red. Huaihai ti ba. Beijing: Zhonghua shu ju, 1985.

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1150-1223, Ye Shi, i Zhen Dexiu 1178-1235, red. Zhizhai ti ba. Beijing: Zhonghua shu ju, 1985.

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Renlong, Qian, red. Zhu yun ti ba. Beijing: Zhonghua shu ju, 1991.

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1123-1202, Hong Mai, red. Wan qiu ti ba. Beijing: Zhonghua shu ju, 1985.

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1045-1105, Huang Tingjian, red. Wei gong ti ba. Beijing: Zhonghua shu ju, 1985.

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1658-1723, Wang Shihong, Wu Dongfa 1747-1803, He Zhuo 1661-1722 i He Zhuo 1661-1722, red. Di zhai ti ba. Beijing: Zhonghua shu ju, 1991.

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Części książek na temat "Ti ba"

Predel, B. "C - Ti (Carbon - Titanium)". W B - Ba … Cu - Zr, 147–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-44756-6_102.

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Predel, B. "Co - Ti (Cobalt - Titanium)". W B - Ba … Cu - Zr, 229. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-44756-6_168.

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Predel, B. "Cu - Ti (Copper - Titanium)". W B - Ba … Cu - Zr, 268–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-44756-6_194.

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Predel, B. "B - Ti (Boron - Titanium)". W B - Ba … Cu - Zr, 77–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-44756-6_41.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk i I. Savysyuk. "(Ba,Na)10K3Na4.5Ce5(Nb,Ti)6". W Structure Types. Part 8: Space Groups (156) P3m1 – (148) R-3, 411–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-70892-6_213.

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Al-Dousari, Ali, Fatin Al-Mutawaa, Hanan Al-Mansour i Badreya Mandekar. "Inductively Coupled Plasma (ICP)". W Atlas of Fallen Dust in Kuwait, 121–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66977-5_5.

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Abstract The crushed powder from defined dust particlesize fractions was analyzed using inductively coupled spectrometry plasma (ICP) for major and trace elements. The ICP was used for the determination of concentrations of trace elements and six major elements: (Al, Fe, Mg, Ca, Na, and K) and five minor elements (Ba, Cr, V, Ti, and Pb). They are quoted in part per million (ppm). Maps showing high and low concentrations of ICPamong Kuwait.

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Iijima, S. "Electron Microscopic Study on Ti-Ba-Cu-O Superconductor Oxides". W Mechanisms of High Temperature Superconductivity, 304–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74407-5_31.

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Cui, Xue Min, Ji Zhou, Bo Li, Jian Hong Shen i Yue Hui Wang. "Fabrication of Ba-Ti-B-Si-O Glass-Ceramics for LTCC". W Key Engineering Materials, 1853–55. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1853.

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Adachi, Seiji, Koichi Mizuno, Kentaro Setsune i Kiyotaka Wasa. "Superconductivity up to 127 K in TI-Ba-Ca-Cu-O Ceramics". W Advances in Superconductivity III, 331–34. Tokyo: Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68141-0_73.

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Takenaka, Tsuyoshi, Bunichi Rai, Shuichi Koike, Toshihide Nabatame, Katsumi Suzuki, Izumi Hirabayashi i Youichi Enomoto. "Microwave Properties of TI-Ba-Ca-Cu-O Thin Films by Metalorganic Deposition". W Advances in Superconductivity VI, 1151–54. Tokyo: Springer Japan, 1994. http://dx.doi.org/10.1007/978-4-431-68266-0_261.

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Streszczenia konferencji na temat "Ti ba"

Suchaneck, G., i G. Gerlach. "Requirements to (Ba,Ca)(Zr,Ti)O3 electrocaloric materials". W 2013 Joint IEEE Int'l Symp on Applications of Ferroelectrics & Workshop on Piezoresponse Force Microscopy (ISAF/PFM). IEEE, 2013. http://dx.doi.org/10.1109/isaf.2013.6748680.

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Bekker, H., A. Windberger, O. O. Versolato, M. Binder, R. Klawitter i J. R. Crespo López-Urrutia. "Forbidden optical transition in Ti-like Xe, Ba, and Ir". W PROCEEDINGS OF THE XII INTERNATIONAL SYMPOSIUM ON ELECTRON BEAM ION SOURCES AND TRAPS. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4905406.

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Schertzl, K. "FIR response of HTC TI-Ba-Ca-Cu-O films". W 16th International Conference on Infrared and Millimeter Waves. SPIE, 1991. http://dx.doi.org/10.1117/12.2297725.

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Halder, Sandip, i Saluru B. Krupanidhi. "Integrated Ba(Sn,Ti)O 3 films for microactuator applications". W Smart Materials, Structures, and Systems, redaktorzy S. Mohan, B. Dattaguru i S. Gopalakrishnan. SPIE, 2003. http://dx.doi.org/10.1117/12.514577.

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Kishimoto, M., i S. Kitahata. "Temperature dependence of anisotropy field in Co-Ti substituted Ba-ferrite particles". W International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690304.

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Qianru Lin, Dennis Lund Lorenzen i Danyang Wang. "Tailoring the physical properties of (Ba, Ca)(Ti, Zr)O3 - xSm2O3 nanocomposite films". W 2014 IEEE International Nanoelectronics Conference (INEC). IEEE, 2014. http://dx.doi.org/10.1109/inec.2014.7460439.

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He, Xingli, Ioanna Bakaimi, Nur Zatil Ismah Hashim, Yudong Wang, Ali Mostaed, Ian M. Reaney, Qi Luo, Steven Gao, Brian E. Hayden i C. H. Kees De Groot. "(Ba, Sr)(Ti, Mn)O3 Perovskite Films for Co-Planar Waveguide Tunable Microwave Phase Shifters". W 2018 13th European Microwave Integrated Circuits Conference (EuMIC). IEEE, 2018. http://dx.doi.org/10.23919/eumic.2018.8539889.

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Wu, Adam Y. "(Pb,La)(Zr,Ti)O3, (Sr,Ba)TiO3, Ba2NaNb5O15, BaTiO3, LiNbO3, KNbO3, KTiOPO4, beta-BaB2O4, and LiB3O5 thin films for electrooptic applications". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tuaa2.

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Thin films of (Pb,La)(Zr,Ti)O3, (Sr,Ba)TiO3, Ba2NaNb5O15, BaTiO3, LiNbO3, KNbO3, KTiOPO4, beta-BaB2O4, and LiB3O5, some of them highly oriented, have been deposited on various substrates by using rf magnetron sputtering and/or solution coating methods. All the films have the correct crystal structure and stoichiometry. Electro-optic effects and second harmonic generation in these films have been measured and will be presented. The potential applications of these films for integrated optics will be discussed.

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Patil, Naresh M., S. H. Shamkuwar, Namrata Pradnyakar, P. K. Bajpai, K. S. Ojha i K. N. Singh. "Dielectric Properties of Chromium Doped Ba[sub 5]Ti[sub 2]O[sub 7]Cl[sub 4]". W XVI NATIONAL SEMINAR ON FERROELECTRICS AND DIELECTRICS (NSFD-XVI). AIP, 2011. http://dx.doi.org/10.1063/1.3644427.

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Selc¸uk, Nevin, Yusuf Gogebakan i Zuhal Gogebakan. "Partitioning of Trace Elements During Fluidized Bed Combustion of High Ash Content Lignite". W 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78068.

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The behavior of 20 trace elements (As, B, Ba, Cd, Co, Cr, Cu, Hg, Li, Mn, Mo, Ni, P, Pb, Sb, Se, Sn, Tl, V, Zn) and 8 major and minor elements (Al, Ca, Fe, K, Mg, Na, Si, Ti) during the combustion of high ash content lignite with and without limestone addition have been investigated in the 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) Test Rig. Experiments were performed without fines recycle. Inert bed material utilized in the experiments was bed ash obtained previously from the combustion of the same lignite without limestone addition in the same test rig. Concentrations of trace elements in coal, limestone, bottom ash, cyclone ash and filter ash were determined by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Measurements show that the distribution of major and minor elements follows the ash split between the bottom ash and fly ash and that the major proportion of most of the trace elements (As, Ba, Cr, Hg, Li, Mo, Ni, Sn, V, Zn) are recovered in fly ash. Comparisons between the trace element partitioning of the runs with and without limestone addition reveal that addition of limestone shifts the partitioning of Ba, Cr, Hg, Mo, Ni, Sn, V, Zn from bottom ash to fly ash.

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Raporty organizacyjne na temat "Ti ba"

Xu, Hongwu, Manuel E. Chavez i Jeremy N. Mitchell. Structural Characterization and Thermochemical Measurements of Ba/Ti-Substituted Pollucites for Radioactive Cs Immobilization. Office of Scientific and Technical Information (OSTI), październik 2012. http://dx.doi.org/10.2172/1052786.

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Knight, R. D., i B. A. Kjarsgaard. Comparative pXRF and Lab ICP-ES/MS methods for mineral resource assessment, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331239.

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The Geological Survey of Canada undertook a mineral resource assessment for a proposed national park in northern Canada (~ 33,500 km2) spanning the transition from boreal forest to barren lands tundra. Bedrock geology of this region is complex and includes the Archean Slave Craton, the Archean and Paleoproterozoic Rae domain of the Churchill Province, the Paleoproterozoic Thelon and Taltson magmatic-tectonic zones, and the Paleoproterozoic East Arm sedimentary basin. The area has variable mineral potential for lode gold, kimberlite-hosted diamonds, VMS, vein uranium and copper, SEDEX, as well as other deposit types. A comparison of analytical methods was carried out after processing the field collected samples to acquire both the &lt; 2 mm and for the &lt; 0.063 mm size fractions for 241 surficial sediment (till) samples, collected using a 10 x 10 km grid. Analytical methods comprised: 1) aqua regia followed by ICP-MS analysis, 2) 4-acid hot dissolution followed by ICP-ES/MS analysis, 3) lithium metaborate/tetraborate fusion methods followed by ICP-ES for major elements and ICP-MS for trace elements and, 4) portable XRF on dried, non-sieved sediment samples subjected to a granular segregation processing technique (to produce a clay-silt proxy) for seventeen elements (Ba, Ca, Cr, Cu, Fe, K, Mn, Ni, Pb, Rb, Sr, Th, Ti, U, V, Zn, and Zr) Results indicate that pXRF data do not replicate exactly the laboratory 4-acid and fusion data (in terms of precision and accuracy), but the relationship between the datasets is systematic as displayed in x-y scattergrams. Interpolated single element plots indicate that till samples with anomalies of high and low pXRF concentration levels are synonymous with high and low laboratory-based analytical concentration levels, respectively. The pXRF interpolations thus illustrate the regional geochemical trends, and most importantly, the significant geochemical anomalies in the surficial samples. These results indicate that pXRF spectrometry for a subset of elements is comparable to traditional laboratory methods. pXRF spectrometry also provides the benefit of rapid analysis and data acquisition that has a direct influence on real time sampling designs. This information facilitates efficient and cost-effective field projects (i.e. where used to identify regions of interest for high density sampling), and to prioritize samples to be analyzed using traditional geochemical methods. These tactics should increase the efficiency and success of a mineral exploration and/or environmental sampling programs.

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